When fitting a muslin or sloper it is more likely than not the seam line placement and/or angel will change. It is also not likely the Front and Back seam allowance raw edges will be even in the custom fitting process. Below is how-to change the Front seam line of a fitting muslin.
1 Here is the Front shoulder seam that was marked while pinned on the body. Draw a solid line along the marked area with a dark sharpie so it can be seen for accurate tracing.
2 Lay a sample of the original pattern piece directly on top of the marked muslin. Trace the new seam line (red). Note: the seam line on this example is only a slight change but do not be alarmed if yours is more extreme.
3 Using a gridded/transparent ruler draw a line 5/8" above the seam line (blue).
4 Trim the pattern on the new cutting line that was created 5/8" above the new seam line.
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